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Best Halcyon Alternatives
Here are some Firefox add-ons that are similar to Halcyon:
horizon-theme
aloysius
2 5.00 
(3) 
Zephyr - Horizon
ZephyrDev
1 0.00 (0) 
Simply Theme For Firefox
Fabrizio Paolo Petrelli
- 0.00 (0) 
Clouds theme
MacTireBan
- 0.00 (0) 
Abstract Theme for Firefox
Vikram Krishna
- 0.00 (0) 
Horizon Bright Theme
Bullfinch
1 5.00 (1) 
GreenBlueTheme
Firefox user 14683738
- 0.00 (0) 
Cygnus
Nate St. George
- 5.00 (1) 
Harmonie
Foxdev
1 0.00 (0) 
Zephyr Night
kschuygon
- 0.00 (0) 
Hyper Snazzy
JCabr
1 0.00 (0)